diff mbox series

[1/8] perf/core: Save the dynamic parts of sample data size

Message ID 20230112214015.1014857-2-namhyung@kernel.org
State New
Headers
Series perf/core: Prepare sample data for BPF |

Commit Message

Namhyung Kim Jan. 12, 2023, 9:40 p.m. UTC 
  The perf sample data can be divided into parts.  The event->header_size
and event->id_header_size keep the static part of the sample data which
is determined by the sample_type flags.

But other parts like CALLCHAIN and BRANCH_STACK are changing dynamically
so it needs to see the actual data.  In preparation of handling repeated
calls for perf_prepare_sample(), it can save the dynamic size to the
perf sample data to avoid the duplicate work.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 include/linux/perf_event.h |  2 ++
 kernel/events/core.c       | 17 ++++++++++-------
 2 files changed, 12 insertions(+), 7 deletions(-)

Comments

Song Liu Jan. 13, 2023, 8:44 p.m. UTC | #1 
On Thu, Jan 12, 2023 at 1:40 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> The perf sample data can be divided into parts.  The event->header_size
> and event->id_header_size keep the static part of the sample data which
> is determined by the sample_type flags.
>
> But other parts like CALLCHAIN and BRANCH_STACK are changing dynamically
> so it needs to see the actual data.  In preparation of handling repeated
> calls for perf_prepare_sample(), it can save the dynamic size to the
> perf sample data to avoid the duplicate work.
>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Acked-by: Song Liu <song@kernel.org>
diff mbox series

Patch

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 03949d017ac9..16b980014449 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1103,6 +1103,7 @@  struct perf_sample_data {
 	 */
 	u64				sample_flags;
 	u64				period;
+	u64				dyn_size;
 
 	/*
 	 * Fields commonly set by __perf_event_header__init_id(),
@@ -1158,6 +1159,7 @@  static inline void perf_sample_data_init(struct perf_sample_data *data,
 	/* remaining struct members initialized in perf_prepare_sample() */
 	data->sample_flags = PERF_SAMPLE_PERIOD;
 	data->period = period;
+	data->dyn_size = 0;
 
 	if (addr) {
 		data->addr = addr;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index eacc3702654d..8c8de26f04ab 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7593,7 +7593,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 
 		size += data->callchain->nr;
 
-		header->size += size * sizeof(u64);
+		data->dyn_size += size * sizeof(u64);
 	}
 
 	if (sample_type & PERF_SAMPLE_RAW) {
@@ -7619,7 +7619,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 			data->raw = NULL;
 		}
 
-		header->size += size;
+		data->dyn_size += size;
 	}
 
 	if (sample_type & PERF_SAMPLE_BRANCH_STACK) {
@@ -7631,7 +7631,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 			size += data->br_stack->nr
 			      * sizeof(struct perf_branch_entry);
 		}
-		header->size += size;
+		data->dyn_size += size;
 	}
 
 	if (sample_type & (PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER))
@@ -7646,7 +7646,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 			size += hweight64(mask) * sizeof(u64);
 		}
 
-		header->size += size;
+		data->dyn_size += size;
 	}
 
 	if (sample_type & PERF_SAMPLE_STACK_USER) {
@@ -7671,7 +7671,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 			size += sizeof(u64) + stack_size;
 
 		data->stack_user_size = stack_size;
-		header->size += size;
+		data->dyn_size += size;
 	}
 
 	if (filtered_sample_type & PERF_SAMPLE_WEIGHT_TYPE)
@@ -7700,7 +7700,7 @@  void perf_prepare_sample(struct perf_event_header *header,
 			size += hweight64(mask) * sizeof(u64);
 		}
 
-		header->size += size;
+		data->dyn_size += size;
 	}
 
 	if (sample_type & PERF_SAMPLE_PHYS_ADDR &&
@@ -7745,8 +7745,11 @@  void perf_prepare_sample(struct perf_event_header *header,
 		size = perf_prepare_sample_aux(event, data, size);
 
 		WARN_ON_ONCE(size + header->size > U16_MAX);
-		header->size += size;
+		data->dyn_size += size + sizeof(u64); /* size above */
 	}
+
+	header->size += data->dyn_size;
+
 	/*
 	 * If you're adding more sample types here, you likely need to do
 	 * something about the overflowing header::size, like repurpose the